Exam 4: Life Is Cellular

An animal cell that contains an extensive network of ________ is likely to be a key source of lipids and/or hormones important in the development and functioning of that animal.

In plants,the epidermis layer functions like a covering of skin to protect the leaf,while vascular bundles carry water and nutrients through the leaf.The palisade mesophyll layer is responsible for most of the photosynthesis that occurs,while the spongy mesophyll layer underneath it aids in the exchange of gases (CO₂ and O₂)and water vapor.In which leaf tissues would one expect to find the highest density of chloroplasts?

A protein molecule,transferrin,embedded in the plasma membrane recognizes iron molecules and causes the plasma membrane to fold in around the iron and take it into the cell.This is an example of

A screen door allows breezes to enter and aromas to exit but keeps out insects.Its function most resembles

All cells living today came from a preexisting ________.

The endoplasmic reticulum (ER)is a single membrane continuous with the nuclear envelope and a series of interconnected sacs throughout the cell.Why might it be beneficial to the cell for the ER to be continuous with the nuclear envelope? It might be beneficial for the ER and nuclear envelope to be connected because it

Scientists repeat their experiments over and over again because they

The figure below depicts transport proteins in a plasma membrane.Molecules are moving through the plasma membrane.How are the molecules moving across the membrane? Is this movement active or passive? Support your answer by describing evidence visible in the figure and stating its significance regarding your answer.

Explain the process through which cells lining blood vessels bring in pockets of fluids from the bloodstream.Is this process specific or nonspecific?

Ross buys a bunch of small,round,red radishes at the grocery store; they are on sale because they have been sitting in the produce aisle for a while.When he gets home he notices their texture is not as crisp and crunchy as he would like.Ross's friend recommends that he refrigerate them in a bowl of water overnight.The next day the radishes are crisp and crunchy again.The most likely explanation of why they became crunchy again after soaking in water is that the water was ________ to the radish cells it contained.So,the water osmosed across the plasma membranes ________ the radish cells,________ the turgor pressure inside of the cells.

Streptococcus pyogenes can cause a bacterial infection of the throat.Since the bacterium lacks a nucleus or membrane-encased organelles,Streptococcus pyogenes is a(n)________ cell type.

An experiment mixed oil (lipids),organophosphate-containing detergent in water,and copper ions to act as a catalyst for a chemical reaction.Membranes budded off of the oil in this mixture.Which of the following is a reasonable and possible explanation of the experimental results?

Match the following cellular structures with their primary function (you may need to use a function more than once). -ribosomes

A factory with an office that controls the information sent to separate rooms for each of the manufacturing and shipping processes would be analogous to a

The Golgi apparatus

Ribosomes are very small nonmembranous organelles that can either exist freely in the cytoplasm or be embedded in the endoplasmic reticulum of a cell.They are associated with the synthesis of

Which of the following would be the best analogy for the function of the Golgi apparatus?

In your own words,briefly point out the primary difference between prokaryotes and eukaryotes,and then explain what might keep viruses from being included in either of these categories.

Viruses use their ________ material to take over their host cell's metabolic machinery to produce the components needed for the virus to reproduce.

The smallest and most basic units of life are microscopic,self-contained units enclosed by a water-repelling membrane and are called ________.